Bump ujson from 4.3.0 to 5.1.0

Bumps [ujson](https://github.com/ultrajson/ultrajson) from 4.3.0 to 5.1.0.
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](ultrajson/ultrajson@4.3.0...5.1.0)

---
updated-dependencies:
- dependency-name: ujson
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -9,7 +9,7 @@ cyvcf2; python_version >= '3.7'
 uvloop==0.14.0; python_version < '3.7'
 uvloop==0.16.0; python_version >= '3.7'
 aiocache==0.11.1
-ujson==4.3.0
+ujson==5.1.0
 aiomcache==0.6.0
 Authlib==0.15.5
 gunicorn==20.1.0

setup.py

@@ -49,7 +49,7 @@
         "cyvcf2==0.10.1; python_version < '3.7'",
         "cyvcf2; python_version >= '3.7'",
         "aiocache==0.11.1",
-        "ujson==4.3.0",
+        "ujson==5.1.0",
         "aiomcache==0.6.0",
     ],
     extras_require={